Unknown Service & Engine Test Codes

nedsim · ‎03-07-2022

I posted previously about persistent jams at the registration assembly in a 9050dn. I'm about as certain as I can be that it's not a mechanical issue in the registration assembly. I've cleaned the clutches and tested them in and out of the reg assembly with a DC power supply. They work when the printer is starting up and when clearing the paper path after a jam, but do not engage when running a print job.

Running a service test displays: "1429,0000,0000,0000" There's no 1429 code listed in my service manual, can't find anything online.

The Event Log page (in addition to the jam codes) reads: "88 0E29 FailCode from Engine Self-Test Execution" I can't find anything on that either.

Does anyone have any idea what these codes are?

Or have any idea what may be preventing the activation of the clutches?

Thanks.

Repairatrooper · ‎03-17-2022

If the clutches are working during startup, I would recommend that you perform a cold reset on the printer. I have found cases where the brains just get scrambled and need to basically start over.

If you find the information provided useful or solves your problems, help other users find the solution easier by giving kudos and marking my post as an accepted solution.
I am a volunteer, offering my knowledge to support fellow users, I do not work for HP nor speak for HP.

nedsim · ‎03-18-2022

Thanks for the reply.

After my previous post I tried a cold reset, with no change to the problem. I just tried again, and also reinitialized the NVRAM. Again, no change.

I found DC controller boards for sale (only $30 with shipping, refurbished, whatever that means) on ebay. Am I correct in assuming this is where the sequencing logic for the mechanics of the printer resides? Does replacing the DC controller seem like a logical next step?

Create an account on the HP Community to personalize your profile and ask a question